[PATCH] D49097: [RegisterCoalescer] Another fix for subrange join unreachable

[Tim Renouf via Phabricator via llvm-commits]

tpr updated this revision to Diff 163634.
tpr added a comment.

V7: Set up undefs correctly, to avoid generating invalid subranges.


Repository:
  rL LLVM

https://reviews.llvm.org/D49097

Files:
  lib/CodeGen/RegisterCoalescer.cpp
  test/CodeGen/AMDGPU/coalescing-subreg-was-undef-but-became-def.mir

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